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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c525bb9d46c13599aee7975d10d745bffadf05fb03d19060936608f6ae0b722' 
  AND token = 'drkokta34WVgHsj332Ez5zPN3qdTAT3yCUmz4eiCEK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}